Public bug reported:
Not sure how to word this one but I'll try:
I've got a server with 2 Network-Interfaces, `ens160` and `ens192`.
There's 3 files in `/etc/netplan/:
/etc/netplan/00-installer-config.yaml.BeforeVMwareCustomization
```yaml
# This is the network config written by 'subiquity'
network:
ethernets:
ens160:
dhcp4: true
version: 2
```
/etc/netplan/99-netcfg-vmware.yaml
```yaml
# Generated by VMWare customization engine.
network:
version: 2
renderer: networkd
ethernets:
ens160:
dhcp4: yes
dhcp4-overrides:
use-dns: false
dhcp6: yes
dhcp6-overrides:
use-dns: false
nameservers:
search:
- mydomain
addresses:
- 10.251.0.18
- 10.251.0.19
- 10.251.0.20
```
/etc/netplan/config.yaml
```yaml
network:
version: 2
ethernets:
ens192:
dhcp4: true
dhcp4-overrides:
use-dns: false
use-routes: false
```
After booting, I have the following routes:
```bash
> ip route show
default via 10.4.0.1 dev ens160 proto dhcp src 10.4.1.47 metric 100
10.4.0.0/16 dev ens160 proto kernel scope link src 10.4.1.47 metric 100
10.4.0.1 dev ens160 proto dhcp scope link src 10.4.1.47 metric 100
10.251.0.18 dev ens192 proto dhcp scope link src 10.255.0.31 metric 100
10.251.0.18 via 10.4.0.1 dev ens160 proto dhcp src 10.4.1.47 metric 100
10.255.0.0/16 dev ens192 proto kernel scope link src 10.255.0.31 metric 100
```
This route-Configuration makes 10.251.0.18 unavailable.
Once I delete the false route, connections to 10.251.0.18 work again:
```bash
> ip route del 10.251.0.18 dev ens192
> ping 10.251.0.18
PING 10.251.0.18 (10.251.0.18) 56(84) bytes of data.
64 bytes from 10.251.0.18: icmp_seq=1 ttl=63 time=0.320 m
```
This wrong route configuration causes my DHCP-Lease to expire before it can be
extended, creating a new lease every time and the network connection to be
dropped for a few seconds each time it does expire.
How can I prevent the false route?
Tidbit: When I delete both routes to 10.251.0.18 and then do `netplan
apply`, both routes are added again. But ordered the other way around.
Meaning that the DHCP-Server is still reachable then.
Versions:
Ubuntu 22.04.5 LTS
netplan 0.106.1-7ubuntu0.22.04.4
** Affects: netplan.io (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2119120
Title:
Netplan adds routes for DHCP-Server for multiple interfaces
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